Yes. You want just a tick of side play so the bearings don't bind up. Out of the box they're too loose in the bulkheads. Manufacturing tolerances will always create a little slop in any part to part fit. That why we have shims to begin with. There's nothing wrong with your kit. I'd be more worried if you didn't have some play between the bulkheads. One good hit could move the bulkhead and bind the diff up. You wouldn't know until the run was over and you burned up a perfectly good bearing.